Improvement in saw-mills



l ,UNITED STATESv PATENT OFFICE.

EARL GUYER, OF VVOLOOTT, VERMONT.

IMPROVEMENT lNsAw-lvllLLs.

Specification formingvpart of Letters Patent No. 34,684, dated March 18, 1862 To all whom it may concern:

Be it known that I, EARL GUYER, of l/Volcott, in the county of Lamoille and State of Vermont,

have invented a new and useful Improvement in Self-Setting Head and Tail Blocks for Saw- Mills; and I do hereby declare that the following is a full, clear, and exact description of the same,referencebeing had to the accompanying drawings, forming part of this specification, in which- Figure l is a perspective view of a saw-mill with my improved setting attachment applied to it. Fig. 2 is a side view of the same. Fig. 3 is a vertical transverse section of the mill through oneof the setting-blocks. Fig. 4 is an inverted plan of the mill. f

Similar letters of reference in the several figures indicate corresponding parts.

The nature of my invention consists in a combination of two ormore incline rails, the attachments of a saw-mill carriage, and a lever arrangement, whereby each end of a log of timber to be sawed is moved automatically on the carriage at right angles to the motion of the carriage, and also the incline rails adjusted out of the Way to admit the gigging back of the carriage.

With my invention aseparate shaft for the feed motion of the head-block can be used, and also a separate shaft for the tail-block, and thus the head-block is independent of the tail-block in its motion, and a positive force is employed for operating each, and while this is so the two incline rails are moved in and out at proper intervals by the carriage traversing back and forth.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

' A represents the foundation of a saw-mill; B,the saw-frame; C, the saw-sash; D, the saw; E, the carriage; F F, the rails of carriage; G, the head-block, and H the tail-block, of the carriage. In all respectsthese parts are substantially similar to those commonly used in sawmills, eXceptin g in some details ofconstruetion rendered necessary in order to apply my im,- provement.

I I are inclined rails hinged at one end to bars J J', which have transverse shoes K K attached to their respective ends, said shoes being grooved on their under side, as shown at d. The other end of each of the rails is supported on the bars by means of an arm b and set-screw c, the lower end of said arm playing freely in a slot d of the bar, but retained iirm after being set by the screw c. The rails thus constructed are arranged one at the head and the other at the tail of the saw-mill, or about in the relation to each other shown, the shoes of the rail-bars fitting snugly over guides e e of the flooring of the mill and sliding on the same in a direction at right angles to the direction in which the carriage travels.

L L are elbow-levers arranged on the under side of they flooring of the saw-mill. Each of these levers has a vertical pin f extending up from its upper side and connecting with the bars of the inclined rails, as shown. The two elbow-levers are connected by means of alongitudinal rod M, which is arranged to reciprocate in a direct-ion indicated by the arrows, No. l. This motion is produced by means of a centrally-pivoted lever N, one endl of which tits in a socket of the rod and the other end bends Ju p and forms a right angle, the said end passing vertically through a curved slot g and terminating above the flooring of the saw-mill, as at vl. rlhe curved slot g, as also the two straight slots h h, in which pins f f play, being of sufficient length to permit the necessary extent of adjustment of the inclined rails.

The head and tail blocks are each provided at s, Fig. 2.

On the side of the carriageE two trips Q R are arranged at such distances apartand at suchpoints that one of them trips the end i of the lever N just at the moment that the log is sawed through and the other j ust at the moment that the carriage has nished its return movement.

The operation is as follows: The log being adjusted to the head-blocks and dogged, the carriage travels forward until the slab is cut off. This movement of the carriage causes the trip Q to strikeV the end i of the lever N, and thus cause said lever to move the rod in a manner to cause it to move the elbow-levers. The movement imparted to the elbow-levers causes the inclined rails to move toward the carriage and in line with the rollers of the 1ever-pawls. The carriage, therefore, in its return movement causes the rollers of the leverpawls to ascend the incline rails, and While this ascension is occurring the pawl ends of the lever-pawls are forcing against the teeth of the ratchet-Wheels of the head and tail blocks, and by this means the head-block and tail-block are moved and the log set to a po sition for a second cut of the sawvthrough it.

The amount of set, of course, is according to theinclination of the rails. When the rails have been traveled their full length, the rolls drop down behind the highest ends thereof, from which position they escape as soon as the rails are moved laterally outof line with them, this A and vfor the purposes set forth.

EARL GUYER. Witnesses:

GUsrAvUs DmrnRrcI-I, EDWIN S. JACOB. 

